Technical Specifications
- Axis Feedback Channel Count: 8 fully independent differential quadrature encoder input channels
- Supported Encoder Signal Standards: A/B/Z differential line driver quadrature, sine/cosine analog encoder, index Z pulse marker
- Maximum Encoder Input Frequency: 10 MHz per individual feedback channel
- Card Host Interface: PMAC-2 dedicated internal expansion bus connector
- Supply Power Input: 5 VDC logic power from PMAC-2 mainframe backplane
- Operating Temperature Range: 0 °C to +60 °C industrial control cabinet ambient
- Digital Isolation Rating: 2,000 VDC galvanic isolation per encoder channel
- Position Counter Resolution: 32-bit bidirectional quadrature position accumulator per axis
Functional Features
- Independent 32-bit hardware position counter for each of 8 encoder axes eliminating CPU counting load
- Per-channel differential signal line termination resistors configurable via on-card DIP switches
- Hardware index pulse capture latch for absolute home position calibration of motion axes
- Channel-level loss-of-encoder-signal hardware fault detection with real-time status flag output
- Isolated differential input circuits fully rejecting industrial electromagnetic interference noise
Performance Parameters
- Maximum quadrature edge processing rate: 40 million edges per second aggregate card throughput
- Encoder signal input propagation delay: ≤ 40 ns channel-to-channel matching skew
- Per-channel isolation breakdown voltage: 2,000 VDC continuous dielectric withstand
- Position counter overflow recovery: Automatic rollover without motion position data corruption
- Rated MTBF: 610,000 operating hours at +25 °C cabinet temperature
- Minimum detectable index pulse width: 100 ns hardware capture threshold
Material Composition
- Printed circuit board substrate: FR4 high-temperature industrial laminate
- Signal isolation components: High-speed optocoupler galvanic isolation ICs
- Encoder terminal header connectors: Gold-plated pin header alloy contacts
- On-card configuration switches: Gold contact DIP mechanical switches
- Card mounting bracket: Cold-rolled steel EMC shielding front panel
Structural Characteristics
- Standard full-length PMAC-2 internal expansion card form factor
- Single-row front panel terminal header block for all 8 encoder channel wiring connections
- Front panel LED status indicators for power, card communication, and individual channel signal loss faults
- Internal edge connector mating directly to PMAC-2 mainframe expansion backplane
- On-board surface-mount signal conditioning circuits densely arranged for compact footprint
Working Principle
Differential quadrature encoder feedback signals from servo motor transducers route into the card’s isolated input terminals. Per-channel optocoupler isolation circuits filter industrial EMI noise and convert differential line signals to single-ended logic levels for on-board FPGA processing. Dedicated hardware FPGA logic counts A/B quadrature pulse edges to update independent 32-bit position accumulators for each axis in real time. Index Z pulse signals trigger hardware latch circuits to freeze position counter values for axis homing routines. The PMAC-2 mainframe motion CPU accesses all 8 axis position register data via the dedicated internal expansion bus to execute closed-loop PID motion control algorithms for automated positioning equipment.
Core Advantages
- 8-axis high-density encoder feedback expansion without consuming separate host computer PCI slots
- Hardware parallel position counting removes quadrature processing load from main motion CPU
- Per-channel galvanic isolation eliminates ground loop damage to precision encoder transducers
- Hardware signal loss detection enables immediate motion system fault interlock activation
- Compatible with all PMAC-2 standard motion control firmware and programming syntax
Applicable Industries
Precision CNC machining centers, automated robotic assembly cells, semiconductor wafer handling equipment, laser cutting precision positioning stages, 3D coordinate measuring machines, medical device automated manufacturing equipment
Installation Requirements
- Power down PMAC-2 mainframe completely before card insertion or removal from expansion backplane
- Align edge connector pins precisely with PMAC-2 internal expansion slot during card seating
- Secure steel front panel mounting bracket to mainframe chassis using supplied machine screws
- Configure channel termination DIP switches to match encoder cable differential impedance rating
- Use shielded differential twisted pair wiring for all encoder feedback cable runs
Usage Precautions
- Do not operate card above +60 °C cabinet ambient temperature to avoid FPGA timing drift errors
- All encoder cable shield drain wires must terminate to single-point chassis ground to eliminate differential noise
- Loss-of-signal fault flags require full axis homing reinitialization after encoder wiring repair
- Avoid routing encoder signal cables parallel to high-power variable frequency drive motor wiring
- Power cycle PMAC-2 mainframe after modifying on-card DIP switch termination configurations
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